I don’t know, this probably happens in other countries too. However, the first time I remembered encountering it was after I moved to the Netherlands.
Last night, Home Alone 2: Lost in New York was on TV. It started at 8:30pm and ended at 10:30pm. Or so I thought… Around 10:20, I turned to Marco and said: “I don’t understand how this movie is going to end in 10 minutes. Kevin is just starting to prepare his offensive against those two robbers.” Marco thought for a moment and said: “Oh. I know what they are doing”, in a slightly offended tone. We looked it up:

Eek! It doesn’t end at all at 10:30. The TV provider just decided to skip a few programs in between. With a sinking heart, I realized I’d have to stay awake until 11:55pm to see the whole movie. I’m no spring chicken, so I decided there was no second half of the movie for me.
It’s not the first time this has happened – I remember our friend Roger mentioning how he hates that, since he would change the channel during the “intermission” programs and then forget to go back – but it was still annoying.
Oh well. My parents (and most of the US, who are able to watch the 24 hour TV marathon) will be happy to know there is a copy of A Christmas Story on the table, waiting to be watched. Repeatedly. It’s tradition!